Numerical modeling and optimization of joint strength in resistance spot welding of galvanized steel sheets

2017 ◽  
Vol 92 (9-12) ◽  
pp. 3489-3501 ◽  
Author(s):  
Fatemeh Mirzaei ◽  
Hamid Ghorbani ◽  
Farhad Kolahan
Keyword(s):  
Numerical Modeling ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Joint Strength ◽  
Galvanized Steel ◽  
Modeling And Optimization ◽  
Resistance Spot ◽  
Steel Sheets

Surface lubrication influence on electrode degradation during resistance spot welding of hot dip galvanized steel sheets

2015 ◽  
Vol 216 ◽  
pp. 339-347 ◽  
Author(s):  
M. Spitz ◽  
M. Fleischanderl ◽  
R. Sierlinger ◽  
M. Reischauer ◽  
F. Perndorfer ◽  
...  
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Galvanized Steel ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Electrode Degradation

Effect of Gap between Steel Sheet and Electrode on Resistance Spot Welding

2018 ◽  
Vol 941 ◽  
pp. 158-163 ◽  
Author(s):  
Sho Matsui ◽  
Chisato Wakabayashi ◽  
Shinji Kodama
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Joint Strength ◽  
Steel Sheet ◽  
High Tensile Strength ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Tension Tests ◽  
Cross Tension

If resistance spot welding (RSW) is conducted when there is a gap between a steel sheet and an unmovable electrode, the steel sheets are bended by a movable electrode, and the quality of RSW is influenced. Therefore, it is necessary to understand the effect of the gap on RSW. In this study, two high-tensile strength steel sheets were welded with the gap. In addition, cross-section observations and cross tension tests were conducted to verify the effect of the gap on weldability and joint strength. Consequently, two notable results were obtained. First, the observation indicated that deformation around the corona-bond was varied depending on the gap. Second, the cross tension tests showed that the gap decreased the joint strength even though the nugget was large enough. These result indicated that controlling the gap is important to ensure the quality of RSW.

scholarly journals OPTIMIZATION OF THE RESISTANCE SPOT WELDING PROCESS OF SECC-AF AND SGCC GALVANIZED STEEL SHEET USING THE TAGUCHI METHOD

SINERGI ◽  
2021 ◽  
Vol 25 (3) ◽  
pp. 319
Author(s):  
Sukarman Sukarman ◽  
Amri Abdulah ◽  
Apang Djafar Shieddieque ◽  
Nana Rahdiana ◽  
Khoirudin Khoirudin
Keyword(s):  
Shear Strength ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Current ◽  
Galvanized Steel ◽  
Welding Time ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Resistance Spot ◽  
Steel Sheets

This article present the optimization work describes out to joint the dissimilar galvanized steel of SECC-AF (JIS G 3313) and SGCC (JIS G 3302) material. A zinc coating on the surfaces of the galvanized steel sheets will decrease the weldability characteristic of the material. This study used dissimilar galvanised steel sheets to obtain the highest tensile shear strength from the specified resistance spot welding. This research used the Taguchi method with 4-variables and mixed-experimental levels. The mixed-experimental level, namely 2-experimental levels for the first variable and 3-experimental levels for other variables. The highest tensile shear strength was achieved in 5282.13 N. This condition is achieved at a squeezed time of 20 cycles, 27 kA-welding currents, welding time of 0.5 seconds, and holding time of 18 cycles. The S/N ratio analysis has shown the welding current had the most significant effect, followed by welding time, squeeze time, and holding time. The delta values of S/N ratio were 0.79, 0.64, 0.26 and 0.07, respectively. The ANOVA analysis has shown that the P-value of welding current and welding time is 0.006 (0.6%) and 0.015 (1.5%), respectively. This result is expected for optimizing resistance spot welding quality in other materials or significant aspects.

Evaluation of Corrosion Resistance of Galvanized Steel Sheets Used in Automotive Production

2015 ◽  
Vol 818 ◽  
pp. 141-144
Author(s):  
Luboš Kaščák ◽  
Janette Brezinová ◽  
Jacek Mucha
Keyword(s):  
Corrosion Resistance ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Zinc Coating ◽  
High Rate ◽  
Galvanized Steel ◽  
Electrochemical Characteristics ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Body Production

The steel sheets used for the car body production are protected against corrosion by zinc coating. Resistance spot welding is used mainly for joining these sheets, because of its high speed and adaptability for automation in high-rate production. However, resistance spot welding has a negative influence on the corrosion resistance of joints. The paper focuses on the analysis of quality of welds on galvanized steel sheets and their corrosive properties. Tensile test and accelerated corrosion test in corrosive environment were used for evaluation of the welds’ quality. Protective efficiency of zinc coatings for automobile sheets was evaluated as well, based on the determination of their electrochemical characteristics in passivated and non-passivated state, as well as their corrosion resistance in simulated corrosion environments. Two types of DX54D+Z material were used for experiments: non-passivated and passivated with Cr3+.

Experimental Researches on Using Resistance Spot Welding for Built-Up Cold-Formed Beams Made of Corrugated Galvanized Steel Sheets

2021 ◽  
Vol 1164 ◽  
pp. 3-8
Author(s):  
Bogdan Radu ◽  
Viorel Ungureanu ◽  
Ioan Both ◽  
Mircea Burcă ◽  
Ştefan Benzar ◽  
...  
Keyword(s):  
Welded Joints ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Materials Science ◽  
Steel Structures ◽  
Galvanized Steel ◽  
Steel Beams ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Materials Science And Engineering

The paper presents the results of researches carried out by a joint team from Department of Steel Structures and Structural Mechanics, together with Department of Materials Science and Engineering, from University Politehnica Timisoara, focused on the possibility of creating built-up cold-formed steel beams made of corrugated galvanized steel sheets by resistance welding, which will replace the similar beams built by self-drilling screws. Resistance spot welding technologies were developed and tested, together with mechanical testing of the welded joints, which were performed in our laboratories. The results obtained and presented confirm the good quality of the welded joints and, as a result, the good capability of this technology to be used in production, to replace the old type of beams.

Experimental Investigations on Capabilities of Resistance Spot Welding and MIG Brazing for Producing Corrugated Beams Using Galvanized Steel Sheets

2021 ◽  
Vol 1164 ◽  
pp. 47-54
Author(s):  
Bogdan Radu ◽  
Viorel Ungureanu ◽  
Ioan Both ◽  
Mircea Burcă ◽  
Ştefan Benzar ◽  
...  
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Materials Science ◽  
Research Work ◽  
Steel Structures ◽  
Galvanized Steel ◽  
Experimental Investigations ◽  
Steel Beams ◽  
Resistance Spot ◽  
Steel Sheets

This paper summarized the research work carried out by a team from Department of Steel Structures and Structural Mechanics, together with Department of Materials Science and Engineering, from University Politehnica Timisoara, which tried to determine the possibility to use welding for obtaining built-up cold-formed steel beams made of corrugated galvanized steel sheets (grade S350GD+Z). There were analyzed two joining processes: MIG brazing and Resistance Spot Welding with the aim to replace the self-drilling screws used until now. The results are very promising and these solutions of joining have beside economic advantages also technical and quality ones.

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